Diphenylnaphthylmethane dye.



, UNITED STATES PATEN OFFICE.

MAX WE ILER, OF ELITRFELD, GERMANY, ASSIGNOR TOFARBENFABRIKEN VORM. FRIEDR- BAYER & '00., OF ELBERFELD, GERMANY A CORPORATION OF GERMANY.

DIPHIENYLNAPHTHYLMETHANE DYE.

' Patented June 30,1908.

Application filed March 13, me Serlal No. 420,807.

To all whom it may concern:

Be it known that I, MAX WEILER, doctor of philosophy, chemist, citizen of the German Empire, residing at Elberfeld, Germany, Kingdom of Prussia, have invented new and useful Improvements in New Diphenylnaiphthylmethane Dyestuif, of whlch the owing is a specification.

My invention relates to the manufacture and production of new dyestuffs of the vdiphenylnaphthylmethane series which are obtained b condensing tetraalk lized diami-' nobenzhy rols with 1-naphtho -3.6.8-trisulfonic acid and oxidizin the leuco-compounds thus obtained. he new dyestuffs are dark owders soluble in water with a bluish co or. They dye Wool from acid baths from blue to green shades which are remarkable for their excellent fastness to alkalies. y

' In carrying out my invention I can proceed as follows, the'parts being by weight: A mixture of 604 arts of tetramethyl-paradiaminobenzhydro 1040 parts of l-naphthol-3.6.8-trisulfonate of sodium and 6000 arts of sulfuric acid (40 per cent) is heated or about 60 hours on the water bath until the whole hydrol has entered into reaction. The leuco-compound which has partly separated out is then completely precipitated y the addition of 1000 parts of Water and2400 parts of sodium carbonate. The leuco-compound thus produced is then transformed. in the usual manner into the calcium salt and this into the sodium salt. To produce the coloring matter from this leuco-compound,

\ 400 parts of it are dissolved in 3400 parts of water and 84 parts of sodium carbonate and r then at a temperature of about 30 0., 1800 mg well stirred and the stirring is afterwards.

parts of a lead dioxid aste (containing 10 per-cent. of PbO,) are a ded, the solution beuarter of an hour. When lshed the lead is precipicontinued for a the-oxidation is ta'ted by means of sodium carbonate and the new dyestufl is recipitated in the usual manner by the a dition of sulfuric acid and common salt. It is after being dried and pulverized in the shape of its acid sodium salt a dark powder easily soluble in -water with a bluisheen color and soluble in concentrated sul uric acid With a yellowish brown color. It dyes wool from acid baths blue-green shades. The dye from tetra-ethylhydrol dyes wool yellowish blue-green.

Having now described my invention and in what manner the same is to be performed, I declare that what I claim is:

1. The herein-described new dyestuffs of the diphenylnaphthylmethane series obtain able by. condensing tetraalkyliz'ed diamino benzhydrols with 1-naphthol-3 6 .S-trisulfonic acid and oxidizing the leuco-compounds thus obtained, which dyestuffs are after being dried and pulverized dark powders soluble in water with abluish color and dyeing wool from acid baths from blue to green shades, substantially as described.

2 The. herein-described new dyestuif of the diphenylnaphthylmethane series obtainable by condensin tetramethyl-para-diaminobenzhydrol wit 1-naphthol-3.6.8-trisulfonic acid and oxidizin the leuco-compound thus obtained whic dyestufi' is after eing dried and pulverized in the shape of its acid sodium salt a dark powder easily soluble in water with a bluish-green color, soluble in concentrated sulfuric acid with a yellowish brown color, and dyeing wool from acid baths blue-green shades, substantially as described. In testimony whereofI have hereunto set my hand in the presence of two subscribing witnesses.

WEILER. [L..s.] Witnesses:

Orro Korma,

WM. Wasnmeron BRUNsWIoK. 

